linux-kernel - Re: [PATCH v5 01/15] scsi: ufs: clear UTRD, UPIU req and rsp before new transfers

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Message-ID: <25858eda615f63aa89c032011d02e8d6.squirrel@www.codeaurora.org>
Date:	Tue, 27 Oct 2015 14:53:35 -0000
From:	"Gilad Broner" <gbroner@...eaurora.org>
To:	"Yaniv Gardi" <ygardi@...eaurora.org>
Cc:	robherring2@...il.com, james.bottomley@...senpartnership.com,
	pebolle@...cali.nl, hch@...radead.org,
	linux-kernel@...r.kernel.org, linux-scsi@...r.kernel.org,
	linux-arm-msm@...r.kernel.org, santoshsy@...il.com,
	linux-scsi-owner@...r.kernel.org, subhashj@...eaurora.org,
	ygardi@...eaurora.org, gbroner@...eaurora.org,
	draviv@...eaurora.org, "Maya Erez" <merez@...eaurora.org>,
	"Vinayak Holikatti" <vinholikatti@...il.com>,
	"James E.J. Bottomley" <jbottomley@...n.com>
Subject: Re: [PATCH v5 01/15] scsi: ufs: clear UTRD, UPIU req and rsp before
 new transfers

Looks OK.
Reviewed-by: Gilad Broner <gbroner@...eaurora.org>

> Clear the UFS data structures before sending new request.
>
> The SCSI command is sent to the device within the UFS UPIU request.
> As part of the transfer UPIU preparation, the SCSI command is copied
> to the UPIU structure according to the SCSI command size.
> As different SCSI commands differ in size from each other, we need
> to clear the whole SCSI command field to prevent sending uninitialized
> data to the device.
>
> The UPIU response doesn't always include the sense data and can differ
> in size.
> Hence, the UPIU response should also be cleared before the transfer.
>
> Signed-off-by: Subhash Jadavani <subhashj@...eaurora.org>
> Signed-off-by: Maya Erez <merez@...eaurora.org>
> Signed-off-by: Yaniv Gardi <ygardi@...eaurora.org>
>
> ---
>  drivers/scsi/ufs/ufshcd.c | 17 +++++++++++++----
>  1 file changed, 13 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
> index 131c720..3428f72 100644
> --- a/drivers/scsi/ufs/ufshcd.c
> +++ b/drivers/scsi/ufs/ufshcd.c
> @@ -3,7 +3,7 @@
>   *
>   * This code is based on drivers/scsi/ufs/ufshcd.c
>   * Copyright (C) 2011-2013 Samsung India Software Operations
> - * Copyright (c) 2013-2014, The Linux Foundation. All rights reserved.
> + * Copyright (c) 2013-2015, The Linux Foundation. All rights reserved.
>   *
>   * Authors:
>   *	Santosh Yaraganavi <santosh.sy@...sung.com>
> @@ -1035,6 +1035,7 @@ static int ufshcd_map_sg(struct ufshcd_lrb *lrbp)
>  				cpu_to_le32(lower_32_bits(sg->dma_address));
>  			prd_table[i].upper_addr =
>  				cpu_to_le32(upper_32_bits(sg->dma_address));
> +			prd_table[i].reserved = 0;
>  		}
>  	} else {
>  		lrbp->utr_descriptor_ptr->prd_table_length = 0;
> @@ -1117,7 +1118,8 @@ static void ufshcd_prepare_req_desc_hdr(struct
> ufshcd_lrb *lrbp,
>
>  	/* Transfer request descriptor header fields */
>  	req_desc->header.dword_0 = cpu_to_le32(dword_0);
> -
> +	/* dword_1 is reserved, hence it is set to 0 */
> +	req_desc->header.dword_1 = 0;
>  	/*
>  	 * assigning invalid value for command status. Controller
>  	 * updates OCS on command completion, with the command
> @@ -1125,6 +1127,8 @@ static void ufshcd_prepare_req_desc_hdr(struct
> ufshcd_lrb *lrbp,
>  	 */
>  	req_desc->header.dword_2 =
>  		cpu_to_le32(OCS_INVALID_COMMAND_STATUS);
> +	/* dword_3 is reserved, hence it is set to 0 */
> +	req_desc->header.dword_3 = 0;
>  }
>
>  /**
> @@ -1137,6 +1141,7 @@ static
>  void ufshcd_prepare_utp_scsi_cmd_upiu(struct ufshcd_lrb *lrbp, u32
> upiu_flags)
>  {
>  	struct utp_upiu_req *ucd_req_ptr = lrbp->ucd_req_ptr;
> +	unsigned short cdb_len;
>
>  	/* command descriptor fields */
>  	ucd_req_ptr->header.dword_0 = UPIU_HEADER_DWORD(
> @@ -1151,8 +1156,12 @@ void ufshcd_prepare_utp_scsi_cmd_upiu(struct
> ufshcd_lrb *lrbp, u32 upiu_flags)
>  	ucd_req_ptr->sc.exp_data_transfer_len =
>  		cpu_to_be32(lrbp->cmd->sdb.length);
>
> -	memcpy(ucd_req_ptr->sc.cdb, lrbp->cmd->cmnd,
> -		(min_t(unsigned short, lrbp->cmd->cmd_len, MAX_CDB_SIZE)));
> +	cdb_len = min_t(unsigned short, lrbp->cmd->cmd_len, MAX_CDB_SIZE);
> +	memcpy(ucd_req_ptr->sc.cdb, lrbp->cmd->cmnd, cdb_len);
> +	if (cdb_len < MAX_CDB_SIZE)
> +		memset(ucd_req_ptr->sc.cdb + cdb_len, 0,
> +		       (MAX_CDB_SIZE - cdb_len));
> +	memset(lrbp->ucd_rsp_ptr, 0, sizeof(struct utp_upiu_rsp));
>  }
>
>  /**
> --
> 1.8.5.2
>
> --
> QUALCOMM ISRAEL, on behalf of Qualcomm Innovation Center, Inc. is a member
> of Code Aurora Forum, hosted by The Linux Foundation
> --
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-- 
Qualcomm Israel, on behalf of Qualcomm Innovation Center, Inc.
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project

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